25_38/2013Organic Light-Emitting Diodes: Above 30% External Quantum Efficiency in Blue Phosphorescent Organic Light-Emitting Diodes Using Pyrido[2,3-b]indole Derivatives as Host Materials (Adv. Mater. 38/2013)

High external quantum efficiencies of above 30% in blue phosphorescent organic light-emitting diodes are demonstrated by Jun Yeob Lee and Chil Won Lee on page 5450 using novel pyridoindolebased bipolar host materials. This is the first work reporting above 30% external quantum efficiency in blue organic light-emitting diodes and opens a way to enhance the external quantum efficiency of blue organic light-emitting diodes up to a theoretical limit of 40%.

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